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Mirrors > Home > MPE Home > Th. List > dm0rn0 | Structured version Visualization version GIF version |
Description: An empty domain is equivalent to an empty range. (Contributed by NM, 21-May-1998.) |
Ref | Expression |
---|---|
dm0rn0 | ⊢ (dom 𝐴 = ∅ ↔ ran 𝐴 = ∅) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | alnex 1784 | . . . . . 6 ⊢ (∀𝑥 ¬ ∃𝑦 𝑥𝐴𝑦 ↔ ¬ ∃𝑥∃𝑦 𝑥𝐴𝑦) | |
2 | excom 2162 | . . . . . 6 ⊢ (∃𝑥∃𝑦 𝑥𝐴𝑦 ↔ ∃𝑦∃𝑥 𝑥𝐴𝑦) | |
3 | 1, 2 | xchbinx 334 | . . . . 5 ⊢ (∀𝑥 ¬ ∃𝑦 𝑥𝐴𝑦 ↔ ¬ ∃𝑦∃𝑥 𝑥𝐴𝑦) |
4 | alnex 1784 | . . . . 5 ⊢ (∀𝑦 ¬ ∃𝑥 𝑥𝐴𝑦 ↔ ¬ ∃𝑦∃𝑥 𝑥𝐴𝑦) | |
5 | 3, 4 | bitr4i 277 | . . . 4 ⊢ (∀𝑥 ¬ ∃𝑦 𝑥𝐴𝑦 ↔ ∀𝑦 ¬ ∃𝑥 𝑥𝐴𝑦) |
6 | noel 4264 | . . . . . 6 ⊢ ¬ 𝑥 ∈ ∅ | |
7 | 6 | nbn 373 | . . . . 5 ⊢ (¬ ∃𝑦 𝑥𝐴𝑦 ↔ (∃𝑦 𝑥𝐴𝑦 ↔ 𝑥 ∈ ∅)) |
8 | 7 | albii 1822 | . . . 4 ⊢ (∀𝑥 ¬ ∃𝑦 𝑥𝐴𝑦 ↔ ∀𝑥(∃𝑦 𝑥𝐴𝑦 ↔ 𝑥 ∈ ∅)) |
9 | noel 4264 | . . . . . 6 ⊢ ¬ 𝑦 ∈ ∅ | |
10 | 9 | nbn 373 | . . . . 5 ⊢ (¬ ∃𝑥 𝑥𝐴𝑦 ↔ (∃𝑥 𝑥𝐴𝑦 ↔ 𝑦 ∈ ∅)) |
11 | 10 | albii 1822 | . . . 4 ⊢ (∀𝑦 ¬ ∃𝑥 𝑥𝐴𝑦 ↔ ∀𝑦(∃𝑥 𝑥𝐴𝑦 ↔ 𝑦 ∈ ∅)) |
12 | 5, 8, 11 | 3bitr3i 301 | . . 3 ⊢ (∀𝑥(∃𝑦 𝑥𝐴𝑦 ↔ 𝑥 ∈ ∅) ↔ ∀𝑦(∃𝑥 𝑥𝐴𝑦 ↔ 𝑦 ∈ ∅)) |
13 | abeq1 2873 | . . 3 ⊢ ({𝑥 ∣ ∃𝑦 𝑥𝐴𝑦} = ∅ ↔ ∀𝑥(∃𝑦 𝑥𝐴𝑦 ↔ 𝑥 ∈ ∅)) | |
14 | abeq1 2873 | . . 3 ⊢ ({𝑦 ∣ ∃𝑥 𝑥𝐴𝑦} = ∅ ↔ ∀𝑦(∃𝑥 𝑥𝐴𝑦 ↔ 𝑦 ∈ ∅)) | |
15 | 12, 13, 14 | 3bitr4i 303 | . 2 ⊢ ({𝑥 ∣ ∃𝑦 𝑥𝐴𝑦} = ∅ ↔ {𝑦 ∣ ∃𝑥 𝑥𝐴𝑦} = ∅) |
16 | df-dm 5594 | . . 3 ⊢ dom 𝐴 = {𝑥 ∣ ∃𝑦 𝑥𝐴𝑦} | |
17 | 16 | eqeq1i 2743 | . 2 ⊢ (dom 𝐴 = ∅ ↔ {𝑥 ∣ ∃𝑦 𝑥𝐴𝑦} = ∅) |
18 | dfrn2 5790 | . . 3 ⊢ ran 𝐴 = {𝑦 ∣ ∃𝑥 𝑥𝐴𝑦} | |
19 | 18 | eqeq1i 2743 | . 2 ⊢ (ran 𝐴 = ∅ ↔ {𝑦 ∣ ∃𝑥 𝑥𝐴𝑦} = ∅) |
20 | 15, 17, 19 | 3bitr4i 303 | 1 ⊢ (dom 𝐴 = ∅ ↔ ran 𝐴 = ∅) |
Colors of variables: wff setvar class |
Syntax hints: ¬ wn 3 ↔ wb 205 ∀wal 1537 = wceq 1539 ∃wex 1782 ∈ wcel 2106 {cab 2715 ∅c0 4256 class class class wbr 5073 dom cdm 5584 ran crn 5585 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1798 ax-4 1812 ax-5 1913 ax-6 1971 ax-7 2011 ax-8 2108 ax-9 2116 ax-10 2137 ax-11 2154 ax-12 2171 ax-ext 2709 ax-sep 5221 ax-nul 5228 ax-pr 5350 |
This theorem depends on definitions: df-bi 206 df-an 397 df-or 845 df-3an 1088 df-tru 1542 df-fal 1552 df-ex 1783 df-nf 1787 df-sb 2068 df-clab 2716 df-cleq 2730 df-clel 2816 df-rab 3073 df-v 3431 df-dif 3889 df-un 3891 df-nul 4257 df-if 4460 df-sn 4562 df-pr 4564 df-op 4568 df-br 5074 df-opab 5136 df-cnv 5592 df-dm 5594 df-rn 5595 |
This theorem is referenced by: rn0 5828 relrn0 5871 imadisj 5981 rnsnn0 6104 rnmpt0f 6139 f00 6648 f0rn0 6651 2nd0 7827 iinon 8158 onoviun 8161 onnseq 8162 map0b 8658 fodomfib 9080 intrnfi 9162 wdomtr 9321 noinfep 9405 wemapwe 9442 fin23lem31 10109 fin23lem40 10117 isf34lem7 10145 isf34lem6 10146 ttukeylem6 10280 fodomb 10292 rpnnen1lem4 12730 rpnnen1lem5 12731 fseqsupcl 13707 fseqsupubi 13708 dmtrclfv 14739 ruclem11 15959 prmreclem6 16632 0ram 16731 0ram2 16732 0ramcl 16734 gsumval2 18380 ghmrn 18857 gexex 19464 gsumval3 19518 subdrgint 20081 iinopn 22061 hauscmplem 22567 fbasrn 23045 alexsublem 23205 evth 24132 minveclem1 24598 minveclem3b 24602 ovollb2 24663 ovolunlem1a 24670 ovolunlem1 24671 ovoliunlem1 24676 ovoliun2 24680 ioombl1lem4 24735 uniioombllem1 24755 uniioombllem2 24757 uniioombllem6 24762 mbfsup 24838 mbfinf 24839 mbflimsup 24840 itg1climres 24889 itg2monolem1 24925 itg2mono 24928 itg2i1fseq2 24931 itg2cnlem1 24936 minvecolem1 29244 rge0scvg 31907 esumpcvgval 32054 cvmsss2 33244 fin2so 35772 ptrecube 35785 heicant 35820 isbnd3 35950 totbndbnd 35955 rnnonrel 41180 stoweidlem35 43557 hoicvr 44067 |
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